Cement-kiln.



0. ELLIS.

CEMENT KILN.

PATENTED APR. 25, 1905.

APPLIOATION FILED FEB. 17, 1905.

2 SHEETS-SHEET 1.

:i I In 9 m m m PATENTED APR. GI ELLIS. 25, 1905.

CEMENT KILN.

APPLIUATION FILED I'EB. 17, 1905.

2 BHEETSSHEBT 2.

I l l l NTOR WITNESSES: #44149 50%.

NO. 788,503. Patented April 25, 1905.

UNITED STATES PATENT OFFICE.

OARLETON ELLIS, OF NEW YORK. N. Y., ASSIGNOR TO ELDRED PROCESS COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

CEMENT-KILN.

SPECIFICATION forming part of Letters Patent No. 788,503, dated April 25, 1905.

Application filed February 17, 1965. Serial No. 246,045.

all whom it y 007L087? 3 and 3 are the stacks through which the Be .it known that I, OARLETON ELLIs, a citiproducts of combustion are discharged into zen of the United States. and a resident of New the air.

York city, in the county of New York and The housings 2 and 2 are ordinarily con- State of New York, have invented certain new structed of brick. Around these housings 5 5 and useful Improvements in Cement-Kilns, of are built walls or outer housings, forming a which the following is a specification. partitioned space 4 and 4. The walls inclos- This invention relates to apparatus for the ing the space 4 and 4c are tightly closed and burning of cement, and especially to the use made as far as possible impervious to the pasin this operation of the waste heat now carsage of gases. 6O ried away in the products of combustion. 5 and 5, as above mentioned, represent the As is well known, the rotary kiln for the fuel-feed pipes, through which powdered or burning of Portland cement is a highly-inefgaseous fuel may be discharged or fed into ficient apparatus from the standpoint of fuel the kilns 1 and 1, respectively. The pipes consumption Itmust necessarily be of large 6 and 6' lead from passages 4 and 4: to the 5 diameter to secure the rapid and intense comfeed end of the kilns l and 1. bustion required for the clinkering of ce- The fan-blowers 7 and 7' are arranged to ment. On that account a great volume of force a gas-draft carrying oxygen for suphighly-heated gases is carried up the stack, porting combustion through the preheatingand most of the heat from the coal consumed passages 4c and 4: and to deliver this draft- 7 goes to waste in this manner. It is variously current through 6 and 6' to the fuel -feed estimated that from seventy to ninety per ends of the kilns 1 and 1, respectively. The cent. of the total heat energy of the coal is air or oxygen required for this purpose may lost in this manner. be taken in through the air-inlets 11 and 11.

2 5 It is the object of this invention to set forth An adjustment of the amount of air required 75 an arrangement of kilns and apparatus defor this purpose may be made by means of signed to recover the heat ordinarily lost in the gates 8 and 8'. A connection from the the above manner. For this purpose the apfans to the stacks 3 and 3' may be made by paratus shown in the accompanying drawings means of the pipes 9 and 9, fitted with addiscloses a mode of application of the ideainjusting-gates 10 and 10 to enable the dilu- 8O volved in this invention and illustrates an tion of the air by products of combustion adaptation which I regard as one of the best whenever the fuel requirements are such that of the forms in which my invention may be this is found to be necessary, although the embodied. use of the products of combustion in this In the accompanying drawings, Figure 1 manner is not claimed as a part of the pres- 5 illustrates diagrammatically a plan of two ceent invention. ment-kilns 1 and 1. Fig. 2 is a vertical lon- My method of operation is as follows: gitudinal section of kiln 1, taken through Powdered fuel is introduced into the pipes 5 the center of the kiln. Fig. 3 comprises a and 5 by compressed air in the usual manner,

4 vertical cross-section of kiln 1, taken through or if a gas-producer is used this may be sup- 9 the center of stack, and an end elevation of plied from any suitable gas-producing applikiln 1. ance situated near the kilns and delivering the The kilns 1 and 1 are arranged to feed the gas into the kiln through the aforesaid fuelcement material in opposite directions, the passages. The fan 7 and 7 being in operafuel being applied in kiln 1 through supplytion and the gates 8 and 8 opened to admit pipe 5 at a point opposite to the stack on kiln the necessary air, it will be seen that this air 1 and in kiln 1 through supply-pipe 5 at a can pass only through the spaces between the point opposite to the stack on kiln 1. partitions formed by the housings aforesaid 2 and 2' are housings surrounding the kilns and that it thereby comes in contact with the 5 at the stack end of 1 and 1", respectively. i highly-heated walls of the inner housings 2 I 0 and 2, which are kept heated to a high temperature through contact on the opposite side with the products of combustion from the kilns. The air traverses this regenerative passage and depart-s through the air-pipes 6 and 6, discharging into the kilns and mingling with the fuel supplied by pipes 5 and 5'.

I do not limit myself to any precise construction of the recuperators used in preheating this air-supply, as any form of passage permitting air to travel freely and to come in contact with walls heated by products of combustion passing on the opposite side may be used for this purpose.

The drawings show connections only for two kilns; but it is obvious that a battery of kilns may easily be constructed to avail of the heat-conserving means hereinbefore described, in which case it is evident that the kilns should be arranged in alternate position as regards the direction of feed in order that the stack of one kiln may be in proximity to the clinkering or fuel-feed end of an adjacent kiln.

What I claim is 1. The combination, in apparatus for burning cement, of a pair of long, rotary kilns so inclined that the material passing through one of said kilns travels in a direction approximately opposite to that of the flow of material in the other kiln, at the stack end of each kiln a continuous heat-recuperator, means for passing air through said recuperator, and means for conveying the air, preheated by its passage through the recuperator of one kiln, into the juxtaposited fuel-feeding end of the other kiln.

2. The combination, in apparatus for burning cement, of a pair of long, rotary kilns so inclined that the material passing through one of said kilns travels in a direction approximately opposite to that of the flow of material in the other kiln, at the stack end of each kiln a heat-regenerator, means for passing air through said regenerator and means for conveying the air, preheated by its passage through the regenerator of one kiln, into the jufrtaposited fuel-feeding end of the other ki n.

Signed at New York city, in the county of New York and State of New York, this 15th day of February, A. D. 1905.

CARLETON ELLIS.

Witnesses:

A. M. SENIOR, WARREN E. DIXON. 

